1. Optimal conditions for the Bell test using spontaneous parametric down-conversion sources
- Author
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Hirotaka Terai, Mikio Fujiwara, Kentaro Wakui, Masahiro Takeoka, Shigehito Miki, Masahide Sasaki, Yoshiaki Tsujimoto, and Kazuhiro Hayasaka
- Subjects
Physics ,Quantum Physics ,Photon ,FOS: Physical sciences ,CHSH inequality ,01 natural sciences ,010309 optics ,Wavelength ,Spontaneous parametric down-conversion ,Postselection ,Quantum state ,Quantum mechanics ,0103 physical sciences ,Bell test experiments ,Quantum Physics (quant-ph) ,010306 general physics ,Parametric statistics - Abstract
We theoretically and experimentally investigate the optimal conditions for the Bell experiment using spontaneous parametric down conversion (SPDC) sources. In theory, we show that relatively large average photon number (typically $\sim$0.5) is desirable to observe the maximum violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality. In experiment, we perform the Bell experiment without postselection using polarization entangled photon pairs at 1550 nm telecommunication wavelength generated from SPDC sources. While the violation of the CHSH inequality is not directly observed due to the overall detection efficiencies of our system, the experimental values agree well with those obtained by the theory with experimental imperfections. Furthermore, in the range of the small average photon numbers ($\leq0.1$), we propose and demonstrate a method to estimate the ideal CHSH value intrinsically contained in the tested state from the lossy experimental data without assuming the input quantum state., Comment: 9 pages, 5 figures
- Published
- 2018